Is there a good starter program that’s generally recommended?
Try this video, it's a visualized follow-along breathing exercise: https://www.youtube.com/watch?v=uxayUBd6T7M
That one is called Box Breathing, where you breathe in a 3-3-3-3 pattern (3-second inhale, 3-second hold, 3-second exhale, 3-second hold).
They have a bunch of different breathing exercises on their app, Calm, which I know has a 7-day free trial period. They have descriptions that help you understand the different exercises better. Some breathing patterns are designed to energize you while others help you unwind.
Thank-you, I will try that!